Superheater



Nov. 3, 1931. w. H. ARMACOST 'SUPERHEATER Filed March 19. 1929 ATTORNEY Patented Nov. 3, 1931 {Q wiLBUR HfARMacos'r', on NEW. YORK, Y., ASSIGNOR TO THE surnnnna rna com.

iATENT oFFic'E PALNY, oi nnw Yonigu. u

p st'rr aannn'riin Application filed March 19, 1929.. Serial No. 348,205.

My inventionrelates tosup'erheater boilers and has for its principal obj ect the provision.

ofan improved form of superheater. which -may. be readily modified to meet changes in superheating l requirements caused by a change inthe pressure or capacity at whic the boiler is operated,

In orderqto anticipate future and greater demands onpower plant installations, it is becoming increasingly common when installing new equipment to install boilers capable of operating either at greater capacity or pressure, or ,both, than the immediate requirements of the plant call. for, with the end in view of subsequently increasing either the "boiler pressure or rating, or both, as thedemands for steam increase. 'It'is obviously desirable to run the boiler and superheater at maximum efficiency,"both as originally installed and as latermodified, and in order to.

accomplish this purpose, it is necessary to considerably modify the-superheater if, the boiler operatingpressure or rating is mate rially changed; I Heretofore such procedurehas necessitated the rebuilding or replacingof the original superheaterinstalled and the present invention'contemplates the elimination of this undesirable requirementby the provision of a novel form of superheater, whichwill operate efficiently with the boiler as originally.

' installed and which, in casechange is made v in the boiler operating-rate or pressure, may;

be modifiedat the minimum expense and in a manner which utilizes, in the modified form-,all or substantially all of the'original superheater. I I

' The manner in which .the invention is car ried into effect may best be understood from a consideration of the following detailed description of an illustrative embodiment thereof, shown in the accompanying drawings, in which Fig. 1 is a vertical section through a i superheater as modified.

v Qtypical interdeck, cross drum boiler,with the superheater as originally installed in accordance withmy invention, and Fig. 2 is a fragmentary vertical section taken through the Referring now to Fig. 1, the boilerillus,

. trated is of the conventional form comprising spaced banks of generating tubes 1 and 2 supplied with water from the steam and Water drum 3 through the connecting nipples 4 and 5 and headers 6 and 7. Steam and water discharged-from the generating tubes are carried through the uptake headers 8 and 9, ni

plurality of relatively long tubular super heating units 17. In the form shown thesuperheating units 17 are composed of aplura-lity of integrally joined loops with the inlet end of the units connected to header 14. As

. will be noted, the superheater units17 occupy only a portion of the space 18 between tube banks 1 and 2 and the outlet ends of'these units are spaced from the superheater outlet header-16. Short auxiliary tubes 19 serve to connect the outlet'ends of the units 17 with the header16l In some instances the ends 17 a of the superheater units may be initially bent so that they can be connected directly to the header 16, but theuse of the auxiliary short tubes 19 is to be preferred for areason explained later.

While the specific mannerv'ot securing the units to the headers and toeach other is not germane-to the invention, detachable connections are highly desirable in order to secure the maximum" benefit from its use, and the joints are preferably made in accordance with the disclosures in U. S. Patents #1363; 713 and #1,610,7 41, granted to Benjamin 'Broido 'on December 28, 1920 and December lb. per sq. in. pressure absolute, but that for,

use insupplyingsteam to an existing turbine, it is to be operated at only 250 lb. per sq. in.

' pressure absolute and at a given rating. This means that saturated steam at 401 deg. F. will be supplied to the superheater and assum- 

